CONTENTS. 5 



Department Bulletin No. 330. — Cereal Experiments in Maryland and 

 Virginia: Page- 

 Introduction 1 



Cereal production in Maryland and Virginia 2 



Physical factors .' 3 



Nature of the experiments 6 



Conditions of the plat experiments 7 



Experiments with winter wheat 9 



Experiments with winter spelt and emmer 26 



Experiment s with winter rye 30 



Experiments with winter oats 34 



Experiments with winter barley 42 



Experiments with spring-sown grains 49 



Summary 49 



Publications of the United States Department of Agriculture relating to 



cereals •. . . 52 



Department Bulletin No. 337. — A Study of the Tenant Systems of 

 Farming in the Yazoo-Mississippi Delta: 



Summary of results 1 



Territory studied 2 



Method of investigation 4 



Methods of renting land 6 



Factors of production 7 



Labor income 10 



Landlords' profits • 12 



Acreage and yield of cotton , 13 



Department Bulletin No. 338. — Machinery Cost of Farm Operations 

 in Western New York: 



Summary of results 2 



Scope of inquiry 3 



Sources of data 4 



Methods of computing machinery replacement costs : 5 



Methods of computing the interest charge 5 



Method of determining the service of farm machinery 6 



Explanation of the tables G 



The cost of repairs 7 



Detailed study of implements 7 



Relation of annual repairs to first cost 21 



Shelter 22 



Relation of machinery cost to cost of farm operations 23 



Conclusion 24 



Department Bulletin No. 339. — Experiments on the Economical Use of 

 Irrigation Water in Idaho: 



Introduction 1 



Plan of investigation 2 



Weather conditions in Idaho during the investigation 6 



Results obtained during 1910, 1911, 1912, and 1913 , 9 



Measurement of water used on farms and under complete canal systems. . . 43 



Seepage investigation - * 47 



Survey of waste lands in Idaho 52 



Proper duty of water for Idaho 56 



Publications of the U. S. Department of Agriculture relating to irrigation. 58 



Department Bulletin No. 340. — Experiments in Vaccination Against 

 Anthrax : 



Prevalence of anthrax and methods of control 1 



Protective vaccination 2 



Production of serum ' 4 



Standardization of the serum 7 



Experimental data 8 



Preparation of spore vaccine 10 



Technic of administration 11 



Test of the simultaneous method on cattle and sheep 13 



Field tests ..: 13 



Treatment of anthrax in man 15 



Concentration of serum 15 



Conclusions 16 



